Steam-jacket kettle



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UNITED STATES PATENT OFFICE.

WILLIAM N. BARROWS, OF PHILADELPHIA, PENNSYLVANIA.

STEAM-JACKET KETTLE.

SPECIFICATION forming part of Letters Patent No. 233,189, dated October12, 1880. Application filed April 22, 1880. (No model.)

To. all whom 'it may concern Be it known th at I, WILLIAM N. BARRoWs, acitizen ofthe United States, residing in the city and county ofPhiladelphia, State of PennlSylvania, have invented a new and usefulImprovement in Steam Jacket Kettles, which improvement is fully setforth in the following specification and accompanying drawings, inwhich- A Figure l is a top or plan view of the kettle embodying myinvention. Fig. 2 is a view of the under side thereof. Fig. 3 is acentral vertical section of Fig. 1. Fig. Lis a horizontal section inline a: fr, Fig. 3. Fig. 5 is a modiication, showing the ribs of thekettle riveted in position. Fig. 6 is a modification, showing the ribsscrewed or bolted in position. Fig. 7 is a modification showing theouter surface of the kettle scalloped `or corrugated in lieu of theribs. Fig. S is a modification showing scallops or corrugations in lieuof the top ribs.

Similar letters of reference indicate correspending parts in the severalgures.

My invention relates to a jacket-kettle the kettle of which isexteriorly ribbed, scalloped, or corrugated, the kettle thus possessinggreat strength, and adapted to be made thin and light, thereby enablingthe heating or cooking to be quickly and economically accomplished,other advantages being presented, as will be hereinafter set forth.

Referring to the drawings, A represents the kettle and B the jacket. Thekettle A is formed of wrought or cast iron or other metal, and has attop a flange, G, which rests 011 the flanged edge a of the jacket B, andcloses the top of the space between the kettle and jacket, thesecuring-bolts b of the two parts A B pass' ing through the flanges C c.

On the outer surface of the kettle A are a series of ribs, D, whichradiate from the center of the bottom of the kettle to the top lian ge,C, thereof, and on the upper face of said flange are ribs D', whichconnect the ilange and vertical rim' a of the kettle projecting' abovethe iiange.

E represents a stay-bolt, which is passed freely through the bottom ofthe jacket B, and its threaded end screws into the bottom of the kettleA. Packing b is interposed between the head of the bolt E and outer faceof the jacket B, in order to close the joint at the bottom of the kettleand prevent leakage thereat.

The ribs D D in the present case are cast with and upon the kettle, butthey may be riveted, bolted, or otherwise secured to the frame; or, ifdesired, the kettle may be corrugated, scalloped, or otherwiseequivalently constructed.

It will be seen that the ribs D abut against the flange C, and, inconjunction with the ribs D, form a series of arches extending over theexterior surface of the kettle U, the boss d acting as the crown of thearch of the ribs D, thereby giving great strength with the least amountof weight and thickness. It will also be noticed that the diameter ofthe kettle is considerably less than that of the jacket, so that asteam-receiving space, c, exists between the two parts, the shape ofeach part being hemispherical.

When the kettle is in service the steam entering the space c serves toheat or boil the contents of the kettle, the inlet and outlet of steambeing clearly shown in Fig. 3.

The kettle A is formed of comparatively thin or light metal, and theribs D strengthen the main portion thereof so as to withstand thepressure of steam. Furthermore, the tlange C, by which the kettle issuspended and bolted to the jacket, is also vastly strengthened in orderto endure the steam-pressure to which it is subjected. By theseprovisions, also, the weight of the device is considerably reduced, andthe heat created in the space c radiates quickly through the thin metalof the kettle, thus accomplishing the heating or boiling in less timeand economizing steam and fuel.

The stay-bolt E serves to connect the bottoms of the'kettle and jacket,and equalizes the pressure of steam on the two parts. The hemisphericalform of the kettle is preferred, as it leaves an inner unbroken surfaceand facilitates stirring, cleaning, Ste.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

l. The jacket kettle provided 'with the tle C, and boss d, acting as thecrown of the arch, substantially as set forth.

5. The combination, with the ribbed kettle A and exterior kettle, B, ofthe connecting stay-bolt E, constructed and operating sub- 15 stantiallyas and for the purpose set forth.

WM. N. BARROWS.

Witnesses:

JOHN A. WIEDERSHEIM, A. P. GRANT.

